| The remediation of urban sites is a heavy charge for the managers in environment because the urban anthropogenic soils are characterized of a considerably strong heterogeneity physical and chemical due to the presence of remains of construction (concrete, bricks, metal, plastic, etc.) and also industrial wastes (clinker, slag, etc.). The contamination in metal traces elements in these circumstances is therefore inevitable.;The concentrations in elements traces are controlled by the soil sizes particles. In this study, the soil samples were separate in seven particle-size ranges: from 150 microm to 10 mm and analyzed according to the conventional method of sampling and also in correspondence with Gy's alternative theory of sampling. Moreover, concrete, bricks slag, gravel were studied. The total concentrations, of Cd, Co, Cr, Cu, Mn, Ni, Pb and Zn were given for each fraction.;The mass loading of trace metals in a given grain size fraction was identified. High concentrations of Cd were observed in the coarsest fractions (from 10 mm to 3,35 mm) and also in building materials. More than 40-60% of the concentrations of all studied traces metals are contributed by coarse fraction (10 mm to 2 mm) for both sampling procedures in laboratory. Particle size analysis has permitted to find metals concentrations in an individual grain size fraction for two sampling methods, which represent true concentrations, since they are based on mass loading of each fraction analyzed.;Key words: sampling, urban anthropogenic soils (brownfields), particle size chemistry, trace metals. |
